Hydrolysis of acetyl-methionine-containing dipeptides promoted by palladium(II) complexes containing methionine-amino acids as ligands

Article abstract of DOI:10.1246/cl.1998.1079

The [Pd(N,S-Met-a'a'H)(N,S-AcMet-aaH)] (a'a'H and aaH = amino acids) was characterized by electrospray ionization mass spectrometer(ESI-MS) and ¹H NMR, in which Met-a'a'H, as ligand, coordinates to Pd(II) via thioether and terminal amino group, and AcMet-aaH, as substrate, coordinates to Pd(II) via thioether and deprotonated amide nitrogen of methionine. The Met-a'a' bond in ligand is intact, the Met-aa bond in substrate, however, is activated toward hydrolysis The difference in hydrolysis behavior between ligand and substrate may be due to a fused six-membered and five-membered ring formation via thioether, deprotonated amide nitrogen and carbonyl oxygen of methionine residue in substrate.